Webservice Deployment issue in NWDS 7.5

I am working on application migration part for our Portal upgrade (7.0 to 7.5). I have updated the track and I am able to migrate all the DC (Webdynpro Java) and the deployment is also working fine

I have a couple of webservices which implements the portal service which are created with Portal standalone application DC. Now when I try to deploy this DC it fails with the below error. But when I take the par file from old portal and migrate it to ear using Par migration tool, I am able to deploy the ear file. Anything i am missing? Here is the error.

at com.sap.engine.interfaces.webservices.server.deploy.WSDeploymentException.writeReplace(WSDeploymentException.java:60) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at java.io.ObjectStreamClass.invokeWriteReplace(ObjectStreamClass.java:1120) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1136) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548) at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:441) at com.sap.exception.BaseExceptionInfo.writeObject(BaseExceptionInfo.java:1033) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1030) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) at com.sap.engine.services.rmi_p4.DispatchImpl.throwException(DispatchImpl.java:140) at com.sap.engine.services.rmi_p4.DispatchImpl._runInternal(DispatchImpl.java:489) at com.sap.engine.services.rmi_p4.server.ServerDispatchImpl.run(ServerDispatchImpl.java:83) at com.sap.engine.services.rmi_p4.P4Message.process(P4Message.java:72) at com.sap.engine.services.rmi_p4.P4Message.execute(P4Message.java:43) at com.sap.engine.services.cross.fca.FCAConnectorImpl.executeRequest(FCAConnectorImpl.java:1055) at com.sap.engine.services.rmi_p4.P4Message.process(P4Message.java:59) at com.sap.engine.services.cross.fca.MessageReader.run(MessageReader.java:55) ... 3 more